Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928 Second Avenue, Hangzhou, 310018, People's Republic of China.
Zunyi Branch of Guizhou Provincial Tobacco Company, Zunyi, 563000, People's Republic of China.
Arch Microbiol. 2024 Apr 30;206(5):239. doi: 10.1007/s00203-024-03858-z.
Camellia sinensis is an important economic plant grown in southern subtropical hilly areas, especially in China, mainly for the production of tea. Soil acidification is a significant cause of the reduction of yield and quality and continuous cropping obstacles in tea plants. Therefore, chemical and microbial properties of tea growing soils were investigated and phenolic acid-degrading bacteria were isolated from a tea plantation. Chemical and ICP-AES investigations showed that the soils tested were acidic, with pH values of 4.05-5.08, and the pH negatively correlated with K (p < 0.01), Al (p < 0.05), Fe and P. Aluminum was the highest (47-584 mg/kg) nonessential element. Based on high-throughput sequencing, a total of 34 phyla and 583 genera were identified in tea plantation soils. Proteobacteria and Acidobacteria were the main dominant phyla and the highest abundance of Acidobacteria was found in three soils, with nearly 22% for the genus Gp2. Based on the functional abundance values, general function predicts the highest abundance, while the abundance of amino acids and carbon transport and metabolism were higher in soils with pH less than 5. According to Biolog Eco Plate™ assay, the soil microorganisms utilized amino acids well, followed by polymers and phenolic acids. Three strains with good phenolic acid degradation rates were obtained, and they were identified as Bacillus thuringiensis B1, Bacillus amyloliquefaciens B2 and Bacillus subtilis B3, respectively. The three strains significantly relieved the inhibition of peanut germination and growth by ferulic acid, p-coumaric acid, p-hydroxybenzoic acid, cinnamic acid, and mixed acids. Combination of the three isolates showed reduced relief of the four phenolic acids due to the antagonist of B2 against B1 and B3. The three phenolic acid degradation strains isolated from acidic soils display potential in improving the acidification and imbalance in soils of C. sinensis.
茶树是一种重要的经济植物,生长在亚热带丘陵地区,特别是在中国,主要用于生产茶叶。土壤酸化是茶树减产和品质下降以及连作障碍的一个重要原因。因此,我们对茶园土壤的化学和微生物特性进行了调查,并从茶园中分离出了降解酚酸的细菌。化学和 ICP-AES 调查表明,所测试的土壤呈酸性,pH 值为 4.05-5.08,pH 值与 K(p<0.01)、Al(p<0.05)、Fe 和 P 呈负相关。Al 是最高的(47-584mg/kg)非必需元素。基于高通量测序,共鉴定出茶园土壤中 34 个门和 583 个属。变形菌门和酸杆菌门是主要的优势门,在三种土壤中酸杆菌的丰度最高,其中属 Gp2 的丰度接近 22%。基于功能丰度值,一般功能预测丰度最高,而在 pH 值低于 5 的土壤中,氨基酸和碳运输与代谢的丰度较高。根据 Biolog Eco Plate™ 测定,土壤微生物对氨基酸的利用率较高,其次是聚合物和酚酸。获得了三株具有良好酚酸降解率的菌株,分别鉴定为苏云金芽孢杆菌 B1、解淀粉芽孢杆菌 B2 和枯草芽孢杆菌 B3。这三株菌显著缓解了阿魏酸、对香豆酸、对羟基苯甲酸、肉桂酸和混合酸对花生萌发和生长的抑制作用。由于 B2 对 B1 和 B3 的拮抗作用,三种分离株的组合对四种酚酸的缓解作用降低。从酸性土壤中分离出的三株酚酸降解菌在改善茶树土壤酸化和失衡方面具有潜在应用价值。